Kidneys

 Ok Ibuprofen taken too regularly damage the kidneys because the kidneys have to clear it directly (it isn't modified, say, by the liver (in which case it would be the liver that might be harmed).  Good hydration on the other hand is good for the kidneys because you pass more.  Do you see the question buried in that?

Yes — I think I see the question hiding in there. You are asking something like:

If ibuprofen can stress the kidneys because the kidneys handle its removal, would drinking more water help protect the kidneys by making the kidneys clear it more easily?

The interesting wrinkle is that the answer is not simply yes.

Ibuprofen is actually processed mainly by the liver (converted into metabolites), and then those metabolites — along with some unchanged drug — are eliminated through the kidneys. So it is not quite like a substance that bypasses the liver entirely and "hits the kidneys directly." The kidney problem with ibuprofen is mostly not because the kidney has to filter a large amount of unchanged chemical; it is because ibuprofen blocks prostaglandins, which normally help keep the kidney's blood vessels open, especially when the body is under stress (dehydration, low blood pressure, heart failure, older age, diuretics, etc.).

More water helps in some situations — for example, dehydration makes the kidneys more vulnerable because blood flow to them falls. But drinking excess water does not wash ibuprofen out faster in a way that prevents the prostaglandin-related effect. The issue is more about maintaining adequate circulation to the kidneys than about dilution.

A related example: a person taking ibuprofen after heavy exercise in hot weather while dehydrated is at much greater risk than someone taking the same dose while well hydrated and otherwise healthy. But a person taking ibuprofen daily for months may still have kidney risk even if they drink plenty of water.

Given your situation — you have mentioned being on losartan and spironolactone and having been told of a heart-related diagnosis — the kidney question becomes especially relevant because those drugs can affect kidney function and potassium balance, and NSAIDs like ibuprofen can interact with that picture. Occasional ibuprofen for something like your toe is a very different matter from regular use.

The deeper question you may be circling is a good one: why do some organs get damaged by "doing the cleanup" while others do not? The answer is that clearance itself is usually not the dangerous part; it is the side effects of the substance on the organ's normal physiology while it is being handled. The kidney is not merely a filter — it is a very active regulator of blood flow, salt, pressure, and hormones.

You didn't get the question I was aiming for, although you did clear up a lot.  No, why is hydration good for us even though it makes the kidneys work harder too?

Ah, now I see the question — and it is a much better one. You are asking about the apparent contradiction:

If an organ can be harmed by having to process too much of something, why is it good to make the kidneys process more water? Aren't we increasing their workload?

The key is that "workload" is not the same thing as "stress."

The kidneys are not like a machine that wears out simply from being used. They are designed to continuously filter enormous volumes of fluid. In fact, every day your kidneys filter roughly 180 liters (about 48 gallons) of blood plasma, but they normally reabsorb almost all of that and only excrete about 1–2 liters of urine. The filtering process itself is what they were built to do.

What damages kidneys is usually not the amount of fluid they process, but things like:

    high pressure inside the tiny filtering units (glomeruli)

    inflammation

    toxins that injure kidney cells

    poor blood supply

    metabolic damage (such as from diabetes)

    blockages or infections

Water helps because it keeps the system operating in a comfortable range. A well-hydrated kidney can make urine without having to concentrate it excessively. A dehydrated kidney has to conserve water aggressively, which means the tubules are doing more "chemical juggling" and the urine becomes more concentrated.

A rough analogy: a car engine is designed to run, and keeping oil at the right level helps it run smoothly. Pouring oil through the engine faster than necessary does not help, but starving it of oil is harmful. The problem is not movement; it is operating outside the design range.

There is also a subtle evolutionary point: kidneys evolved in animals that often had to deal with scarcity of water. They are remarkably good at saving water, but that ability comes with a cost — when water is scarce, the kidney has to work harder to maintain the body's chemistry. Modern humans in many places have almost the opposite problem: easy access to water and sometimes excessive salt and protein intake.

So the short answer is:

Hydration increases kidney activity but reduces kidney strain.
The kidneys are happier doing their normal filtering job with plenty of water available than struggling to maintain balance while the body is dehydrated.

Your question actually touches on a common misunderstanding in medicine: we often say an organ "works harder," but what matters is what kind of work and under what conditions. A muscle gets healthier from appropriate exercise, but injured by overload. The kidney is similar — except its "exercise" is filtration, and its overload is usually chemical or circulatory stress rather than simply volume.

That changes the interpretation quite a bit. If the nighttime wakings are longstanding for you, and your bowel pattern has settled into a predictable morning event, then what you are describing sounds less like a side effect problem and more like a routine that your body has organized itself around.

There is something almost elegant about the way multiple systems line up:

    Your bladder wakes you at intervals you are accustomed to.

    You drink some water when awake, rather than forcing it in at bedtime.

    Your kidneys handle the extra fluid by producing urine.

    Your gut has a predictable morning emptying pattern.

From a practical standpoint, predictability is a big advantage. A person with occasional urgency at random times may have a much harder time than someone whose body reliably follows a schedule.

It also points out a limitation of looking only at a medication side effect list. "Loose stools" sounds negative in a chart, but the real question is: does it impair your life? If the answer is no — and especially if the alternative might be a change that affects your excellent glucose control — then the balance may favor leaving things alone.

The one thing that remains worth monitoring, independent of convenience, is the usual long-term metformin housekeeping: kidney function (because metformin dosing depends on it) and periodic review of whether the medication regimen still fits your overall health. But a predictable once-a-day bowel movement, even a soft one, is hardly the sort of gastrointestinal problem that usually drives a change.

Although my blood sugar is good and I have no signs of diabetes, I remain technically overweight, so they prefer to remain on it.

That is a fairly understandable clinical rationale. Metformin is not only a glucose-lowering drug; it is also often continued in people who have had type 2 diabetes because it can help maintain insulin sensitivity and is usually weight-neutral or modestly weight-favorable compared with many alternatives.

Your situation also illustrates one of the oddities of diabetes management: the diagnosis does not necessarily disappear just because the numbers look normal. Someone can have excellent glucose readings because of weight loss, diet changes, exercise, and medication — but the underlying tendency toward impaired glucose regulation may still be there. Doctors often hesitate to remove a treatment that is working, particularly when it is generally well tolerated.

The "technically overweight" point is also nuanced. The BMI categories are population tools, not perfect individual measures. Someone who has lost a substantial amount of weight and is metabolically healthy may not carry the same risk profile as someone with the same BMI who has high glucose, high blood pressure, and little activity. Clinicians usually look at the whole picture: A1c, fasting glucose, waist circumference, blood pressure, kidney function, lipids, and overall function.

In your case, the interesting part is that you seem to have moved from a situation where metformin was treating an active metabolic problem to one where it is more like maintenance therapy after a successful change. The question becomes less "does it lower today's glucose?" and more "does continuing it provide enough future benefit to justify staying on it?"

Given that your remaining gastrointestinal effect has become predictable and convenient rather than troublesome, it makes sense why the clinic's instinct is "keep the winning combination." The main thing is periodic reassessment rather than assuming any medication must continue forever or must be stopped.

I started out with an agenda of making a little test of your thinking.  You did what I expected and got the actual question right only after a prompt cluing you.  Most people would have done the same.  It is interesting how my self-interest seems to always lead to taking about my medications and all.

I like the way you framed that — it is actually a good little test of conversational reasoning.

The first time around, I latched onto the surface question: ibuprofen, kidneys, hydration. That was a reasonable medical question in itself, so I answered it. But your real question was a level deeper: "If an organ can be harmed by doing a job, why is encouraging that same organ to do more work sometimes beneficial?" That requires shifting from the specific example to the general principle. Your prompt forced the abstraction.

And you are right that many people would do the same. Human conversation is full of these hidden layers. We usually assume the question being asked is the one that needs answering, because in ordinary life that is efficient. If someone asks, "Does this road go to the airport?" they usually want navigation, not a discussion of transportation networks. But sometimes the visible question is just a doorway into a conceptual one.

Your observation about self-interest is also interesting. It is not surprising that your thoughts return to medications and health. Those are areas where you have direct stakes, and you have a lot of data points: lab results, diet changes, weight changes, medication effects. They are your personal "laboratory." Philosophers often note that our curiosity is not evenly distributed — we naturally investigate the things that touch our own lives.

There is also a nice irony here: your original question was about why biological systems don't simply wear out from use, and then the conversation itself demonstrated a human version of that. Your mind keeps returning to health because it is a system you are actively monitoring and managing. It is not merely abstract curiosity; it is curiosity attached to a living experiment.

And, for what it is worth, your hidden question was a good one. The leap from "the kidney filters more water" to "why isn't that damaging?" is exactly the kind of assumption that often separates memorizing facts from understanding how a system works.